Pistol · Not SAAMI standardized · Not standardizedObsolete
10mm Magnum
10mm Magnum is a rimless straight-walled pistol cartridge of United States origin.
- Caliber
- 0.4″ · 10.16 mm
- Introduced
- 1992
- Case
- Rimless
- Parent
- 10mm Auto
- Primary use
- Hunting, Self-Defense
- Status
- Discontinued
- Obsolete
- Obsolete
- Introduced
- 1992
- Type
- Pistol
- Origin
- United States
- Inventor
- AMT / IAI (developed for the AutoMag IV)
- Manufacturer
- AMT/IAI (AutoMag IV); DoubleTap, Reed's (ammo)
- Standard
- Not SAAMI standardized · Not standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Discontinued
- Availability
- Rare
- Case capacity
- 31.8 gr H₂O
- Twist (typical)
- 1:16
- Primer
- Small Pistol
- Case type
- Rimless
- Max pressure
- 37,500 psi, SAAMI transducer
- Eff. range
- 50 yd
- Max range
- 250 yd
- Recoil
- 13.3–13.4 ft·lb
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for 10mm Magnum, so this is the shape gravity alone gives the advertised velocity. Drag would steepen it. The tool below solves real loads through their published G1 or G7 model.
Open in Ballistic Compare- Parent case
- 10mm Auto
Representative trajectory — modeled from a single velocity input (no published BC for this cartridge yet).
Dimensionscase measurements · scale drawing · size vs familiar rounds
Case dimensions — the scale drawing at the top of the page is built from these.
mixed/other · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 10.16 | 0.400 | · |
| Neck ⌀ | 10.79 | 0.425 | |
| Shoulder ⌀ | n/a | ||
| Shoulder angle | n/a | ||
| Base ⌀ | 10.80 | 0.425 | |
| Rim ⌀ | 10.80 | 0.425 | |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.40 | 0.055 | |
| Neck length | n/a | ||
| Case length | 31.60 | 1.244 | · |
| Overall length | 39.50 | 1.555 | · |
Size vs familiar rounds
Drawn at true 1:1 — every case is accurate relative to the others. Absolute size depends on your screen's pixel density, so measuring one against a real ruler may be off. 10mm Magnum is highlighted below.
Missing a dimension for 10mm Magnum? Some case measurements aren't in a published SAAMI/CIP drawing yet. Have a factory or reamer print? Send it → — verified hard-to-find data earns a free Lindcott sticker.
Reloading costestimate cost per round vs factory
Estimate your cost per round and how it compares to factory. Inputs are yours — nothing is stored.
Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.
Lineage
Connected reference
History
Introduced around 1990 by AMT / IAI (developed for the AutoMag IV), derived from the 10mm Auto.
FAQs
- What twist rate does 10mm Magnum use?
- 10mm Magnum typically uses a 1:16 twist rate.
- What bullet diameter is 10mm Magnum?
- 10mm Magnum uses a 0.4″ (10.16 mm) diameter bullet.
- Is 10mm Magnum still in production?
- 10mm Magnum is discontinued; typical availability is rare.
- What is 10mm Magnum used for?
- 10mm Magnum is primarily used for hunting, self-defense.
- What is 10mm Magnum based on?
- 10mm Magnum is derived from the 10mm Auto case.
Sources & provenance
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
